// lodash函数库
// first / last / toUpper / reverse / each / includes / find / findIndex

const _ = require('lodash')

const array = ['jack', 'tom', 'lucy', 'kate']

console.log(_.first(array))
console.log(_.last(array))
console.log(_.toUpper(_.first(array)))
console.log(_.reverse(array))
let r  = _.each(array,(item,index)=>{
    console.log(item,index)
})
console.log(r)
// console.log(_.includes())